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Kangaroo Defense is a chess opening that arises after 1.d4 e6 2.c4 Bb4+. It is classified A40 in the ECO system, and the position after these moves has white to move.
Each of these is a named opening reached by playing on from 1.d4 e6 2.c4 Bb4+. Open any of them to load the position on the board.